HandyControl/HandyControl/Themes/Styles/TabControl.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:controls="clr-namespace:HandyControl.Controls"
                    xmlns:langs="clr-namespace:HandyControl.Properties.Langs"
                    xmlns:interactivity="clr-namespace:HandyControl.Interactivity">

    <ResourceDictionary.MergedDictionaries>
        <ResourceDictionary Source="../Basic/Paths.xaml"/>
        <ResourceDictionary Source="../Basic/Converters.xaml"/>
        <ResourceDictionary Source="Button.xaml"/>
        <ResourceDictionary Source="ToggleButton.xaml"/>
    </ResourceDictionary.MergedDictionaries>

    <Style TargetType="{x:Type controls:TabItem}">
        <Setter Property="FocusVisualStyle" Value="{x:Null}"/>
        <Setter Property="Foreground" Value="{DynamicResource PrimaryTextBrush}"/>
        <Setter Property="Background" Value="{DynamicResource BackgroundBrush}"/>
        <Setter Property="BorderThickness" Value="1,0,1,1"/>
        <Setter Property="BorderBrush" Value="{DynamicResource BorderBrush}"/>
        <Setter Property="Margin" Value="0"/>
        <Setter Property="Padding" Value="16,0"/>
        <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
        <Setter Property="VerticalContentAlignment" Value="Stretch"/>
        <Setter Property="HeaderTemplate">
            <Setter.Value>
                <DataTemplate>
                    <TextBlock Background="Transparent" Text="{Binding Header,RelativeSource={RelativeSource FindAncestor,AncestorType=controls:TabItem}}"/>
                </DataTemplate>
            </Setter.Value>
        </Setter>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type controls:TabItem}">
                    <Grid x:Name="templateRoot" SnapsToDevicePixels="true">
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition/>
                            <ColumnDefinition Width="Auto"/>
                        </Grid.ColumnDefinitions>
                        <Grid.ContextMenu>
                            <ContextMenu>
                                <MenuItem Command="interactivity:ControlCommands.Close" Header="{x:Static langs:Lang.Close}"/>
                                <MenuItem Command="interactivity:ControlCommands.CloseAll" Header="{x:Static langs:Lang.CloseAll}"/>
                                <MenuItem Command="interactivity:ControlCommands.CloseOther" Header="{x:Static langs:Lang.CloseOther}"/>
                            </ContextMenu>
                        </Grid.ContextMenu>
                        <Border Grid.ColumnSpan="2" BorderThickness="{TemplateBinding BorderThickness}" x:Name="mainBorder" BorderBrush="{TemplateBinding BorderBrush}" Background="{TemplateBinding Background}" Margin="0">
                            <Border Margin="0,0,0,-1" x:Name="innerBorder" Background="White" Opacity="0"/>
                        </Border>
                        <ContentPresenter Grid.Column="0" x:Name="contentPresenter" ContentSource="Header" Focusable="False" HorizontalAlignment="Stretch" Margin="{TemplateBinding Padding}" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="Center">
                            <ContentPresenter.OpacityMask>
                                <LinearGradientBrush EndPoint="1,0" StartPoint="0,0">
                                    <GradientStop Offset="1"/>
                                    <GradientStop Color="White" Offset="0.8"/>
                                </LinearGradientBrush>
                            </ContentPresenter.OpacityMask>
                        </ContentPresenter>
                        <Button Grid.Column="1" x:Name="PART_CloseButton" Visibility="{Binding ShowCloseButton,RelativeSource={RelativeSource FindAncestor,AncestorType=controls:TabControl},Converter={StaticResource Boolean2VisibilityConverter}}" Background="Transparent" Style="{StaticResource ButtonCustom}" Width="28">
                            <Path Fill="{DynamicResource PrimaryTextBrush}" Width="8" Height="8" Style="{StaticResource ClosePathStyle}"/>
                        </Button>
                    </Grid>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsSelected" Value="true">
                            <Setter Property="Panel.ZIndex" Value="1"/>
                            <Setter Property="Opacity" TargetName="innerBorder" Value="1"/>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

    <Style TargetType="{x:Type controls:TabControl}">
        <Setter Property="Padding" Value="0"/>
        <Setter Property="BorderBrush" Value="{DynamicResource BorderBrush}"/>
        <Setter Property="HorizontalContentAlignment" Value="Center"/>
        <Setter Property="VerticalContentAlignment" Value="Center"/>
        <Setter Property="BorderThickness" Value="1"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type controls:TabControl}">
                    <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}">
                        <Grid x:Name="templateRoot" ClipToBounds="true" SnapsToDevicePixels="true" KeyboardNavigation.TabNavigation="Local">
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition x:Name="ColumnDefinition0"/>
                                <ColumnDefinition x:Name="ColumnDefinition1" Width="0"/>
                            </Grid.ColumnDefinitions>
                            <Grid.RowDefinitions>
                                <RowDefinition x:Name="RowDefinition0" Height="Auto"/>
                                <RowDefinition x:Name="RowDefinition1" Height="*"/>
                            </Grid.RowDefinitions>
                            <Border Background="White" BorderThickness="0,0,0,1" BorderBrush="{DynamicResource BorderBrush}">
                                <controls:TabPanel MinHeight="{TemplateBinding TabItemHeight}" TabItemHeight="{TemplateBinding TabItemHeight}" TabItemWidth="{TemplateBinding TabItemWidth}" IsEnableTabFill="{TemplateBinding IsEnableTabFill}" Margin="0,0,-1,-1" x:Name="PART_HeaderPanel" HorizontalAlignment="Left" Background="{DynamicResource SecondaryTextBrush}" IsItemsHost="true" KeyboardNavigation.TabIndex="1" Panel.ZIndex="1">
                                    <interactivity:Interaction.Behaviors>
                                        <interactivity:FluidMoveBehavior AppliesTo="Children" Duration="{Binding FluidMoveDuration,ElementName=PART_HeaderPanel}">
                                            <interactivity:FluidMoveBehavior.EaseX>
                                                <CubicEase EasingMode="EaseOut"/>
                                            </interactivity:FluidMoveBehavior.EaseX>
                                        </interactivity:FluidMoveBehavior>
                                    </interactivity:Interaction.Behaviors>
                                </controls:TabPanel>
                            </Border>
                            <Border x:Name="contentPanel" Grid.Column="0" KeyboardNavigation.DirectionalNavigation="Contained" Grid.Row="1" KeyboardNavigation.TabIndex="2" KeyboardNavigation.TabNavigation="Local">
                                <ContentPresenter x:Name="PART_SelectedContentHost" ContentSource="SelectedContent" Margin="{TemplateBinding Padding}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
                            </Border>
                            <Border Visibility="{Binding Visibility,ElementName=PART_OverflowButton}" Margin="0,-1,0,0" Grid.Row="0" Grid.Column="0" BorderThickness="1,0,0,1" BorderBrush="{DynamicResource BorderBrush}" Background="White" HorizontalAlignment="Right">
                                <controls:ContextMenuToggleButton x:Name="PART_OverflowButton" Visibility="Collapsed" Style="{StaticResource ToggleButtonIconTransparent}" controls:IconSwitchElement.Geometry="{StaticResource DownGeometry}" controls:IconSwitchElement.GeometrySelected="{StaticResource UpGeometry}"/>
                            </Border>
                        </Grid>
                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

</ResourceDictionary>